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r in (-oo:+oo)
(6*r)/5 = 5/9 // - 5/9
(6*r)/5-(5/9) = 0
(6*r)/5-5/9 = 0
6/5*r-5/9 = 0 // + 5/9
6/5*r = 5/9 // : 6/5
r = 5/9/6/5
r = 25/54
r = 25/54
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